Driving mechanism for a moving-picture film.



L. STANEK.

DRIVING MECHANISM FOR A MOVING PICTURE FILM.

APPLICATION men 11:11.21, 1914.

1,208,685. Patented 1111. 12,1916.

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LUCIAN STANEK, OF BOSTON, MASSACHUSETTS.

DRIVING MECHANISM FOR A MOVING-PICTURE FILM.

Specification of Letters Patent.

Patented Dec. 12, 1916.

Application filed February 21, 1914. Serial N 0. 820,322.

To all whom it may concern Be it known that I, LUCIAN citizen of the United States, residing at Roxbury, Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Driving Mechanism for a Moving-Picture Film, of which the following is a specification.

This invention relates to an improved mechanism for driving the film of a moving picture machine.

As is well known to those skilled in the art a film in a moving picture machine has an intermittent motion imparted to it, the film being moved the length of one picture at a time and then stopping, and it is very desirable in mechanisms of this character that the film should be accurately and quickly moved and with as little jar from the driving mechanism as is possible. This necessitates a mechanism which is compact and light and capable of being easily and speedily driven while also being capable of being locked firmly in position when the film is stationary.

To these ends the invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claim thereof.

Referring to the drawings: Figure 1 is sectional elevation of my improved driving mechanism. Fig. 2 is a side elevation of the same as viewed from the right of Fig. 1. Fig. 3 is a side elevation of said mechanism as viewed from the left of Fig. 1. Fig. 4 is a detail elevation of the gears whereby an STANEK, a

' lntermittent motion is imparted to the film.

Fig. 5 is another elevation of said gears as viewed from the left of Fig. 4. Fig. 6 is a detail elevation of said gears similar to Fig. 4 with the driving gear illustrated in a different position relatively to the driven gear.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, referring to Figs. 1 to 6, inclusive, 9 is the frame of the machine, 10 is the power shaft to which a pulley 11 is fastened whereby the shaft 10 is rotated. The shaft 10 has a spiral gear 12 fast thereto which meshes into another spiral gear 13 which is fastened to a driving shaft 14 journaled to rotate in bearings 15 on the frame of the machine. The shaft 14 has a driving gear 16 fast thereto and engaging a driven gear 17 which is fast to a driven shaft 18, to which the means for driving the film is attached, said means consisting of a spool 19 with two gears 20 attached thereto and having teeth 21 on their peripheries adapted to engage said film and impart movement thereto in a manner well known to those skilled in this art.

The driven shaft 18 is locked in position when the film is stationary by a brake 22 which consists of a slide movable in ways 23 upon the frame 9 of the machine. The slide brake 22 has a roll 24 journaled upon an adjustable slide piece 25, which slide piece is adjusted on the slide brake 22 by means of an adjusting screw 26 which has screw-threaded engagement with an ear 27 on the slide brake 22, said screw being locked in position by suitable lock nuts 28.

The roll 24 is adapted to project into a cam groove 29 provided in the pulley l1 and by adjusting the roll 24 toward or away from the center of said pulley 11 the brake 22 may be adjusted toward or away from the shaft 18, so that more or less pressure may be given by the brake to said shaft to lock the same in position when the film is not moving.

The gears 16 and 17 constitute one of the main features of novelty of my invention. These gears are fastened, respectively, to the shafts 14 and 18, the shalf 14 constituting a driving shaft and the shaft 18 a driven shaft. The shafts 14 and 18 are arranged at right angles to each other with their median axial lines in different planes.

The gear 16 has a tooth 30 extending circumferentially of its periphery at right angles to the length of'the shaft 14 and arranged for a portion of its length without,

advancing longitudinally of said shaft, the opposite ends of the tooth 3O terminating in portions 31 and 32 which are inclined at an angle to the length of said shaft and form therebetween an inclined groove 33 which extends across and beyond the opposite sides 34 and 35 of the circumferentially extending portion of the tooth 30. The tooth 30 projects radially beyond the periphery of the gear 16 and fits into and fills the space between the teeth 36 and 37 or between any two adjacent teeth of the gear 17.

The gear 17 is provided with a. plurality of teeth 36, 37, 38 and 39. .Two of said teeth, as, for example, in Fig. 4, the teeth 36 and 37, engage the tooth 30 simultaneously and these teeth are successively engaged by the inclined portions 31 and 32 to rotate the gear 17 intermittently. For example, as the gear 16 rotates in the direction of the arrow (Fig. l) the gear 17 will re main stationary until the tooth 36 enters the groove 33, the opposite sides of said tooth being simultaneously engaged by the end portions 31 and 32 and thus turning the gear 17, with its shaft 18, in the direction of the arrow thereon (Fig. l). The position of the gear when partly rotated and while the tooth 36 is passing through the groove 33 is illustrated in Fig. 6. After the tooth 36 has passed through the groove 33 the teeth 36 and 39 will be in engagement with the tooth 30 on the gear 16 and so on until at each rotation of the gear 16 the gear 17 will be rotated a quarter turn.

The general operation of the mechanism hereinbefore specifically described is as follows: Assuming a film to be engaged by the film driving gears 20, an intermittent motion is imparted to said driving gears 20 by the rotation of the cam pulley 11 which rotates the spiral gears 12 and 13 and thus imparts a rotary movement to the gear 16, which, as hereinbefore described, imparts an intermittent rotary movement to the gear 17 and to its shaft 18 and thus an intermittent movement is imparted to the film gears 20..

engagement with one of the teeth of the gear- 17 whereupon the brake is released by the cam pulley 11 and the gear 17 is rotated a quarter turn and isthenolamped again in position by means of the brake 22 and the cam pulley 11 which operates it.

Having thus described my invention, what I claim and desire by Letters Patent to se-V of said shaft and forming an inclined groove therebetween extending across and beyond the opposite sides of said circumferentially extending portion of said tooth, and a gear fast to said driven shaft witha plurality of teeth on its periphery, two of said teeth simultaneously engaging said tooth on;said driving gear, said first-namedtooth fitting into and filling the space between said teeth, said teeth adapted to be successively engaged by said inclined portions, whereby said driven shaft and its gear may be intermit tently rotated. V y

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

LUCIAN STANEK.

Witnesses CHARLES S, GooDINe, SYDNEY E. TAFT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

